A hard sell even for fans of the series
Battle Ecstasy is exactly what you might expect of a game using this license: a cheap product that uses the female cast as its primary draw. Not that this is necessarily a bad thing, but because of the extra cost associated with this being a 3D brawler and not a visual novel, corners have obviously been cut. Admirably, the animation quality on Rito is surprisingly good, and enemy models are serviceable, but the brawling is incredibly repetitive with a very small number of maneuvers available to you. Environments are also bland and boxy, as though they were randomly generated even though they are not.
The game is split into three parts: exploring dungeons, walking around Rito's very small house and talking to the heroines you have recruited, and the the Trouble Touch Time minigame in which you use the Vita's touchpads to stroke and prod the heroines. These sections are supposed to be erotic, though they come off an entirely redundant given that it is almost impossible to fail them, and the item you select to tease them with makes little difference either in respect to how quickly the progress gauge fills or the response given by heroines. The touch accuracy is also often frustrating.
Talking to heroines around the house is another redundant feature, as they simply stand around and give the same repeated and decontextualised lines. While there is an affection system, this is linked into the TTT system. A certain number of hearts will give you access to events with girls in certain areas of the house, but these never stray from a single formula: Rito gets trapped in a room with a girl, and the only way to release the locked door is to complete the TTT minigame. It becomes very old, quickly.
One dubious "positive" is that the game is easily playable for people with no Japanese ability given that understanding the dialogue is very rarely important for completing the current objective, which is almost always "proceed to the next floor of the dungeon." The game's plot will be understood by even those with a rudimentary ability of Japanese because of the utterly trivial and roundabout dialogue.
In the end, Battle Ecstasy is a game that fails to at being a brawler, and fails to be sexy - which defeats the purpose of using the To Love-ru license. If you want an ecchi game, Senran Kagura or Bullet Girls are far better options.